2025 Declared the 'Year of the Octopus' Along Britain's Southern Shores.

Exceptionally high observations of a remarkably clever cephalopod over the summer months have resulted in the naming of 2025 as the year for octopuses in an annual review of Britain’s seas.

A Perfect Storm Leading to an Explosion

An unusually warm winter coupled with a very warm springtime triggered a huge population of Mediterranean octopuses to settle along the shores from Cornwall to Devon, across the southwestern peninsula.

“The reported landings was of the order of about thirteen times what we would usually anticipate in this region,” stated a marine life specialist. “When we added up the numbers, approximately 233,000 octopuses were present in these waters this year – representing a massive jump from what is typical.”

*Octopus vulgaris* is found in these waters but typically so rare it is rarely seen. An explosive growth is caused by a combination of a mild winter and favorable spring temperatures. These ideal conditions meant increased juvenile survival, possibly in part fuelled by large numbers of other marine life seen in the area.

A Historic Event

The most recent occasion, an octopus bloom of this size was documented in the 1950s, with historical records indicating the one before that happened in 1900.

The remarkable abundance of octopuses meant they could be frequently seen in shallow waters for a rare occurrence. Video footage show octopuses being sociable – contrary to their normally lone nature – and “walking” along the bottom on the tips of their limbs. A curious octopus was even recorded reaching for a diver's camera.

“On my initial dive in that area this year I saw five octopuses,” they noted. “They are sizeable. Two kinds exist in UK waters. The curled octopus is rather small, about the size of a football, but these newcomers can be with a span of 1.5 meters.”

Predictions and Marine Joy

A second gentle winter this coming winter suggests the potential a second bloom the following year, because in the past, under these conditions, populations have surged again for two years running.

“However, it is unlikely, looking at history, that it will become a permanent fixture,” they stated. “But the sea keeps giving us surprises at the moment so it’s a very uncertain scenario.”

The assessment also noted other “surprises, successes and joyful moments” across British shores, including:

• Unprecedented numbers of gray seals seen in one northern region.
• Record numbers of the iconic seabirds on a Welsh island.
• A first-ever sighting of an unusual mollusc in Yorkshire, normally residing farther south.
• A variable blenny spotted off the coast of Sussex for the first time.

Not All Positive News

The year had its low points, however. “The year was bookended by ecological challenges,” noted a conservation leader. “A major tanker collision in March and an accidental discharge of tonnes of plastic biobeads off the Sussex coast served as stark reminders. Dedicated individuals are working tirelessly to defend and heal our shorelines.”